Lives of 53 Crew Members On Board Missing Indonesian Submarine Now Believed Lost

Oxygen on board the submarine is now thought to have run out

Other nations have been helping with the search.

Sky's south-east Asia correspondent, Siobhan Robbins, says air supply is not the only concern:

"There's a possibility that if that submarine sank too low because something went wrong, that the actual water pressure could have broken it apart as well. So it's a very difficult moment. However, the search and rescue teams are still looking as they are determined to bring it home."

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